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c906108c SS |
1 | /* Definitions to make GDB run on an encore under umax 4.2 |
2 | Copyright 1987, 1989, 1991, 1993 Free Software Foundation, Inc. | |
3 | ||
c5aa993b | 4 | This file is part of GDB. |
c906108c | 5 | |
c5aa993b JM |
6 | This program is free software; you can redistribute it and/or modify |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2 of the License, or | |
9 | (at your option) any later version. | |
c906108c | 10 | |
c5aa993b JM |
11 | This program is distributed in the hope that it will be useful, |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
c906108c | 15 | |
c5aa993b JM |
16 | You should have received a copy of the GNU General Public License |
17 | along with this program; if not, write to the Free Software | |
18 | Foundation, Inc., 59 Temple Place - Suite 330, | |
19 | Boston, MA 02111-1307, USA. */ | |
c906108c SS |
20 | |
21 | /* This is also included by tm-ns32km3.h, as well as being used by umax. */ | |
22 | ||
23 | #define TARGET_BYTE_ORDER LITTLE_ENDIAN | |
24 | ||
25 | /* Need to get function ends by adding this to epilogue address from .bf | |
26 | record, not using x_fsize field. */ | |
27 | #define FUNCTION_EPILOGUE_SIZE 4 | |
28 | ||
29 | /* Offset from address of function to start of its code. | |
30 | Zero on most machines. */ | |
31 | ||
32 | #define FUNCTION_START_OFFSET 0 | |
33 | ||
34 | /* Advance PC across any function entry prologue instructions | |
35 | to reach some "real" code. */ | |
36 | ||
b83266a0 SS |
37 | extern CORE_ADDR umax_skip_prologue PARAMS ((CORE_ADDR)); |
38 | #define SKIP_PROLOGUE(pc) (umax_skip_prologue (pc)) | |
c906108c SS |
39 | |
40 | /* Immediately after a function call, return the saved pc. | |
41 | Can't always go through the frames for this because on some machines | |
42 | the new frame is not set up until the new function executes | |
43 | some instructions. */ | |
44 | ||
45 | #define SAVED_PC_AFTER_CALL(frame) \ | |
46 | read_memory_integer (read_register (SP_REGNUM), 4) | |
47 | ||
48 | /* Address of end of stack space. */ | |
49 | ||
50 | #ifndef STACK_END_ADDR | |
51 | #define STACK_END_ADDR (0xfffff000) | |
52 | #endif | |
53 | ||
54 | /* Stack grows downward. */ | |
55 | ||
56 | #define INNER_THAN(lhs,rhs) ((lhs) < (rhs)) | |
57 | ||
58 | /* Sequence of bytes for breakpoint instruction. */ | |
59 | ||
60 | #define BREAKPOINT {0xf2} | |
61 | ||
62 | /* Amount PC must be decremented by after a breakpoint. | |
63 | This is often the number of bytes in BREAKPOINT | |
64 | but not always. */ | |
65 | ||
66 | #define DECR_PC_AFTER_BREAK 0 | |
67 | ||
c5aa993b | 68 | #if 0 /* Disable until fixed *correctly*. */ |
c906108c SS |
69 | #ifndef INVALID_FLOAT |
70 | #ifndef NaN | |
71 | #include <nan.h> | |
c5aa993b | 72 | #endif /* NaN */ |
c906108c SS |
73 | |
74 | /* Return 1 if P points to an invalid floating point value. */ | |
75 | /* Surely wrong for cross-debugging. */ | |
76 | #define INVALID_FLOAT(p, s) \ | |
77 | ((s == sizeof (float))? \ | |
78 | NaF (*(float *) p) : \ | |
79 | NaD (*(double *) p)) | |
80 | #endif /* INVALID_FLOAT */ | |
81 | #endif | |
82 | ||
83 | /* Say how long (ordinary) registers are. This is a piece of bogosity | |
84 | used in push_word and a few other places; REGISTER_RAW_SIZE is the | |
85 | real way to know how big a register is. */ | |
86 | ||
87 | #define REGISTER_SIZE 4 | |
88 | ||
89 | /* Number of machine registers */ | |
90 | ||
91 | #define NUM_REGS 25 | |
92 | ||
93 | #define NUM_GENERAL_REGS 8 | |
94 | ||
95 | /* Initializer for an array of names of registers. | |
96 | There should be NUM_REGS strings in this initializer. */ | |
97 | ||
98 | #define REGISTER_NAMES {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", \ | |
99 | "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", \ | |
100 | "sp", "fp", "pc", "ps", \ | |
101 | "fsr", \ | |
102 | "l0", "l1", "l2", "l3", "xx", \ | |
103 | } | |
104 | ||
105 | /* Register numbers of various important registers. | |
106 | Note that some of these values are "real" register numbers, | |
107 | and correspond to the general registers of the machine, | |
108 | and some are "phony" register numbers which are too large | |
109 | to be actual register numbers as far as the user is concerned | |
110 | but do serve to get the desired values when passed to read_register. */ | |
111 | ||
112 | #define R0_REGNUM 0 /* General register 0 */ | |
113 | #define FP0_REGNUM 8 /* Floating point register 0 */ | |
114 | #define SP_REGNUM 16 /* Contains address of top of stack */ | |
115 | #define AP_REGNUM FP_REGNUM | |
116 | #define FP_REGNUM 17 /* Contains address of executing stack frame */ | |
117 | #define PC_REGNUM 18 /* Contains program counter */ | |
118 | #define PS_REGNUM 19 /* Contains processor status */ | |
119 | #define FPS_REGNUM 20 /* Floating point status register */ | |
120 | #define LP0_REGNUM 21 /* Double register 0 (same as FP0) */ | |
121 | ||
122 | /* Total amount of space needed to store our copies of the machine's | |
123 | register state, the array `registers'. */ | |
124 | #define REGISTER_BYTES \ | |
125 | ((NUM_REGS - 4) * REGISTER_RAW_SIZE(R0_REGNUM) \ | |
126 | + 4 * REGISTER_RAW_SIZE(LP0_REGNUM)) | |
127 | ||
128 | /* Index within `registers' of the first byte of the space for | |
129 | register N. */ | |
130 | ||
131 | #define REGISTER_BYTE(N) ((N) >= LP0_REGNUM ? \ | |
132 | LP0_REGNUM * 4 + ((N) - LP0_REGNUM) * 8 : (N) * 4) | |
133 | ||
134 | /* Number of bytes of storage in the actual machine representation | |
135 | for register N. On the 32000, all regs are 4 bytes | |
136 | except for the doubled floating registers. */ | |
137 | ||
138 | #define REGISTER_RAW_SIZE(N) ((N) >= LP0_REGNUM ? 8 : 4) | |
139 | ||
140 | /* Number of bytes of storage in the program's representation | |
141 | for register N. On the 32000, all regs are 4 bytes | |
142 | except for the doubled floating registers. */ | |
143 | ||
144 | #define REGISTER_VIRTUAL_SIZE(N) ((N) >= LP0_REGNUM ? 8 : 4) | |
145 | ||
146 | /* Largest value REGISTER_RAW_SIZE can have. */ | |
147 | ||
148 | #define MAX_REGISTER_RAW_SIZE 8 | |
149 | ||
150 | /* Largest value REGISTER_VIRTUAL_SIZE can have. */ | |
151 | ||
152 | #define MAX_REGISTER_VIRTUAL_SIZE 8 | |
153 | ||
154 | /* Return the GDB type object for the "standard" data type | |
155 | of data in register N. */ | |
156 | ||
157 | #define REGISTER_VIRTUAL_TYPE(N) \ | |
158 | (((N) < FP0_REGNUM) ? \ | |
159 | builtin_type_int : \ | |
160 | ((N) < FP0_REGNUM + 8) ? \ | |
161 | builtin_type_float : \ | |
162 | ((N) < LP0_REGNUM) ? \ | |
163 | builtin_type_int : \ | |
164 | builtin_type_double) | |
165 | ||
166 | /* Store the address of the place in which to copy the structure the | |
167 | subroutine will return. This is called from call_function. | |
168 | ||
169 | On this machine this is a no-op, because gcc isn't used on it | |
170 | yet. So this calling convention is not used. */ | |
171 | ||
172 | #define STORE_STRUCT_RETURN(ADDR, SP) | |
173 | ||
174 | /* Extract from an array REGBUF containing the (raw) register state | |
175 | a function return value of type TYPE, and copy that, in virtual format, | |
176 | into VALBUF. */ | |
177 | ||
178 | #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \ | |
179 | memcpy (VALBUF, REGBUF+REGISTER_BYTE (TYPE_CODE (TYPE) == TYPE_CODE_FLT ? FP0_REGNUM : 0), TYPE_LENGTH (TYPE)) | |
180 | ||
181 | /* Write into appropriate registers a function return value | |
182 | of type TYPE, given in virtual format. */ | |
183 | ||
184 | #define STORE_RETURN_VALUE(TYPE,VALBUF) \ | |
185 | write_register_bytes (REGISTER_BYTE (TYPE_CODE (TYPE) == TYPE_CODE_FLT ? FP0_REGNUM : 0), VALBUF, TYPE_LENGTH (TYPE)) | |
186 | ||
187 | /* Extract from an array REGBUF containing the (raw) register state | |
188 | the address in which a function should return its structure value, | |
189 | as a CORE_ADDR (or an expression that can be used as one). */ | |
190 | ||
191 | #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(int *)(REGBUF)) | |
192 | \f | |
193 | /* Describe the pointer in each stack frame to the previous stack frame | |
194 | (its caller). */ | |
195 | ||
196 | /* FRAME_CHAIN takes a frame's nominal address | |
197 | and produces the frame's chain-pointer. */ | |
198 | ||
199 | /* In the case of the ns32000 series, the frame's nominal address is the FP | |
200 | value, and at that address is saved previous FP value as a 4-byte word. */ | |
201 | ||
202 | #define FRAME_CHAIN(thisframe) \ | |
203 | (!inside_entry_file ((thisframe)->pc) ? \ | |
204 | read_memory_integer ((thisframe)->frame, 4) :\ | |
205 | 0) | |
206 | ||
207 | /* Define other aspects of the stack frame. */ | |
208 | ||
209 | #define FRAME_SAVED_PC(FRAME) (read_memory_integer ((FRAME)->frame + 4, 4)) | |
210 | ||
211 | /* Compute base of arguments. */ | |
212 | ||
213 | #define FRAME_ARGS_ADDRESS(fi) \ | |
214 | ((ns32k_get_enter_addr ((fi)->pc) > 1) ? \ | |
215 | ((fi)->frame) : (read_register (SP_REGNUM) - 4)) | |
216 | ||
217 | #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame) | |
218 | ||
219 | /* Get the address of the enter opcode for this function, if it is active. | |
220 | Returns positive address > 1 if pc is between enter/exit, | |
221 | 1 if pc before enter or after exit, 0 otherwise. */ | |
222 | ||
223 | extern CORE_ADDR ns32k_get_enter_addr (); | |
224 | ||
c906108c SS |
225 | /* Return number of bytes at start of arglist that are not really args. */ |
226 | ||
227 | #define FRAME_ARGS_SKIP 8 | |
228 | ||
229 | /* Put here the code to store, into a struct frame_saved_regs, | |
230 | the addresses of the saved registers of frame described by FRAME_INFO. | |
231 | This includes special registers such as pc and fp saved in special | |
232 | ways in the stack frame. sp is even more special: | |
233 | the address we return for it IS the sp for the next frame. */ | |
234 | ||
c5aa993b | 235 | extern int umax_frame_num_args PARAMS ((struct frame_info * fi)); |
cce74817 | 236 | #define FRAME_NUM_ARGS(fi) (umax_frame_num_args ((fi))) |
c906108c SS |
237 | \f |
238 | /* Things needed for making the inferior call functions. */ | |
239 | ||
240 | /* Push an empty stack frame, to record the current PC, etc. */ | |
241 | ||
242 | #define PUSH_DUMMY_FRAME \ | |
243 | { register CORE_ADDR sp = read_register (SP_REGNUM);\ | |
244 | register int regnum; \ | |
245 | sp = push_word (sp, read_register (PC_REGNUM)); \ | |
246 | sp = push_word (sp, read_register (FP_REGNUM)); \ | |
247 | write_register (FP_REGNUM, sp); \ | |
248 | for (regnum = 0; regnum < 8; regnum++) \ | |
249 | sp = push_word (sp, read_register (regnum)); \ | |
250 | write_register (SP_REGNUM, sp); \ | |
251 | } | |
252 | ||
253 | /* Discard from the stack the innermost frame, restoring all registers. */ | |
254 | ||
255 | #define POP_FRAME \ | |
256 | { register struct frame_info *frame = get_current_frame (); \ | |
257 | register CORE_ADDR fp; \ | |
258 | register int regnum; \ | |
259 | struct frame_saved_regs fsr; \ | |
260 | struct frame_info *fi; \ | |
261 | fp = frame->frame; \ | |
262 | get_frame_saved_regs (frame, &fsr); \ | |
263 | for (regnum = 0; regnum < 8; regnum++) \ | |
264 | if (fsr.regs[regnum]) \ | |
265 | write_register (regnum, read_memory_integer (fsr.regs[regnum], 4)); \ | |
266 | write_register (FP_REGNUM, read_memory_integer (fp, 4)); \ | |
267 | write_register (PC_REGNUM, read_memory_integer (fp + 4, 4)); \ | |
268 | write_register (SP_REGNUM, fp + 8); \ | |
269 | flush_cached_frames (); \ | |
270 | } | |
271 | ||
272 | /* This sequence of words is the instructions | |
c5aa993b JM |
273 | enter 0xff,0 82 ff 00 |
274 | jsr @0x00010203 7f ae c0 01 02 03 | |
275 | adjspd 0x69696969 7f a5 01 02 03 04 | |
276 | bpt f2 | |
c906108c SS |
277 | Note this is 16 bytes. */ |
278 | ||
279 | #define CALL_DUMMY { 0x7f00ff82, 0x0201c0ae, 0x01a57f03, 0xf2040302 } | |
280 | ||
281 | #define CALL_DUMMY_START_OFFSET 3 | |
282 | #define CALL_DUMMY_LENGTH 16 | |
283 | #define CALL_DUMMY_ADDR 5 | |
284 | #define CALL_DUMMY_NARGS 11 | |
285 | ||
286 | /* Insert the specified number of args and function address | |
287 | into a call sequence of the above form stored at DUMMYNAME. */ | |
288 | ||
289 | #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p) \ | |
290 | { \ | |
291 | int flipped; \ | |
292 | flipped = fun | 0xc0000000; \ | |
293 | flip_bytes (&flipped, 4); \ | |
294 | *((int *) (((char *) dummyname)+CALL_DUMMY_ADDR)) = flipped; \ | |
295 | flipped = - nargs * 4; \ | |
296 | flip_bytes (&flipped, 4); \ | |
297 | *((int *) (((char *) dummyname)+CALL_DUMMY_NARGS)) = flipped; \ | |
298 | } |